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I am restoring a 1984 BMW 323i model E30. I am replacing the Bosch main wiring loom with a Siemans wiring loom. I plan to use the original bosch engine wiring loom and connect it to the multi-plug of the siemans loom. The multi-plugs are totally different but after tracing the wires they both do the same function. Should I solder the wires ? The Siemans system has a Coil Resistor which the Bosch system does not appear to have. Can you advise if there are any other differences.

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Your asking me something now ,havent seen one in years but the cables can be connected over with time and patience and a bit of solder is good as it doesnt corrode ,now the ballast resistor fitted with the siemans was a different type of circuit and as it was a bosch then wire it as the bosch was wired ,because the ballast resistor was used in conjuction with a 9v coil and when you cranked the engine it allowed full 12v voltage to the coil to give an increased spark under crank load ,never did work that well to be honest and the resistors often packed up so use it as the bosch system .On the siemans you had a wire from starter connection on ignition switch to coil and the ignition feed went through the resistor to the coil ,Simple enough but them resistors were a right pain in all honesty

Posted on Jan 03, 2011

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